如何在Flutter | Flutter中基于dateTime对项目列表进行排序

Question

我有产品名称和日期的产品列表。我想根据日期和时间对项目列表进行排序。这是我要排序的项目列表，

List items = [
{
"productName":"Icecream",
"date":"2019-10-17 10:06:12.278"
},
{
"productName":"Juice",
"date":"2021-09-20 19:08:16.274"
},
{
"productName":"Rice",
"date":"2020-05-13 08:02:16.177"
},
{
"productName":"Cheese",
"date":"2021-10-23 20:02:16.254"
},
{
"productName":"Sugar",
"date":"2019-11-22 00:00:00.000"
},
];

这是我想要的预期输出，

List sortedList = [
{
"productName":"Icecream",
"date":"2019-10-17 10:06:12.278"
},
{
"productName":"Sugar",
"date":"2019-11-22 00:00:00.000"
},
{
"productName":"Rice",
"date":"2020-05-13 08:02:16.177"
},
{
"productName":"Juice",
"date":"2021-09-20 19:08:16.274"
},
{
"productName":"Cheese",
"date":"2021-10-23 20:02:16.254"
},
];

Answer 1

这是一个使用内置函数.compareTo的简单代码，可以帮助您:

void main() async {
List items = [
{"productName": "Icecream", "date": "2019-10-17 10:06:12.278"},
{"productName": "Juice", "date": "2021-09-20 19:08:16.274"},
{"productName": "Rice", "date": "2020-05-13 08:02:16.177"},
{"productName": "Cheese", "date": "2021-10-23 20:02:16.254"},
{"productName": "Sugar", "date": "2019-11-22 00:00:00.000"},
];
// You can change the position of `a` and `b` to get a reversed result
// as well
items.sort((a, b) => a['date'].compareTo(b['date']));
print(items);
}

Answer 2

您可以在列表中使用compareTo方法来比较基于这些结果的结果，您可以在列表中使用.sort方法来排序列表